REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

AD10242

FEATURES

Two Matched ADCs with Input Signal Conditioning

Selectable Bipolar Input Voltage Range

( 0.5 V,

1.0 V,

2.0 V)

Full MIL-STD-883B Compliant

80 dB Spurious-Free Dynamic Range

Trimmed Channel-Channel Matching

APPLICATIONS

Radar Processing

Communications Receivers

FLIR Processing

Secure Communications

Any I/Q Signal Processing Application

The AD10242 operates with

±5.0 V for the analog signal condi-

tioning with a separate +5.0 V supply for the analog-to-digital

conversion. Each channel is completely independent allowing

operation with independent encode or analog inputs. The

AD10242 also offers the user a choice of analog input signal

ranges to minimize additional signal conditioning required for

multiple functions within a single system. The heart of the

AD10242 is the AD9042 which is designed specifically for appli-

cations requiring wide dynamic range.

The AD10242 is manufactured by Analog Devices on our

MIL-PRF-38534 MCM line and is completely qualified. Units

are packaged in a custom cofired ceramic 68-lead gull wing

package and specified for operation from –55

°C to +125°C.

Contact the factory for additional custom options including

those which allow the user to ac couple the ADC directly, by-

passing the front end amplifier section. Also see the AD9042

data sheet for additional details on ADC performance.

PRODUCT HIGHLIGHTS

1. Guaranteed sample rate of 40 MSPS.

2. Dynamic performance specified over entire Nyquist band;

spurious signals @ 80 dBc for –1 dBFS input signals.

3. Low power dissipation: <2 W off

±5.0 V supplies.

4. User defined input amplitude.

5. Packaged in 68-lead ceramic leaded chip carrier.

PRODUCT DESCRIPTION

The AD10242 is a complete dual signal chain solution including

onboard amplifiers, references, ADCs, and output buffering pro-

viding unsurpassed total system performance. Each channel is

laser trimmed for gain and offset matching and provides channel-

to-channel crosstalk performance better than 80 dB. The AD10242

utilizes two each of the AD9631, OP279, and the AD9042 in a

custom MCM to gain space, performance, and cost advantages

over solutions previously available.

FUNCTIONAL BLOCK DIAGRAM

OP279

OP279

AD9042

AD9631

9

12

TIMING

D11B (MSB)

D10B

D9B

D8B

D7B

D0B

(LSB)

D1B

D2B

D3B

D4B

D5B

D6B

D9A

D10A

D11A

(MSB)

(LSB) D0A

D1A

D2A

D3A

D4A

D5A

D6A

D7A

D8A

ENC

ENC

AD10242

5

OUTPUT BUFFERING

UNEG

UCOM

UPOS

OP279

OP279

AD9042

AD9631

7

12

TIMING

OUTPUT BUFFERING

UPOS

UNEG

UCOM

ENC

ENC

6

8

7

62

63

56

55

64

57

19

20

21

22

23

24

25

17

18

12

3

4

28

29

31

32

33

36

40

41

42

38

37

39

52

51

49

48

47

46

45

Dual, 12-Bit, 40 MSPS MCM A/D Converter

with Analog Input Signal Conditioning

a

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,

U.S.A.

Tel: 617/329-4700

World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

© Analog Devices, Inc., 1997